Distributed renewable energy power station voltage regulation transient performance testing system and method

Abstract

The present invention relates to a distributed new energy power station voltage regulation transient performance test system and method, including: a computer, a message mapping device, a switch, an analog quantity acquisition device, a clock source device, an AVC substation and an execution terminal; the computer is connected to the message mapping device, the message mapping device is connected to the analog quantity acquisition device, the computer is also connected to the AVC substation through the switch, the computer is also connected to the execution terminal through the switch, the output end of the AVC substation is connected to the analog quantity acquisition device, the output end of the AVC substation is also connected to the execution terminal, and the output end of the clock source device is respectively connected to the AVC substation and the computer. The present invention can verify each other in two ways to improve the measurement accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of voltage regulation transient performance testing, and relates to a voltage regulation transient performance testing system and method, in particular to a voltage regulation transient performance testing system and method for a distributed new energy power station. Background Art

[0002] Since the beginning of the 21st century, the economy and society have developed rapidly, the world's energy demand has grown rapidly, and fossil energy will become increasingly depleted and accompanied by environmental pollution and other problems. Therefore, green and clean new energy grid-connected power generation technology has received widespread attention, such as solar energy, wind energy and other power generation forms. Clean and efficient new energy power generation technology is making important contributions to the world's economic and social development.

[0003] The voltage regulation of renewable energy power stations is achieved through the automatic voltage regulation control system (AVC). The dispatcher sends the target value to the AVC substation of the renewable energy power station, and the AVC substation converts the dispatching instruction into a target instruction that can be recognized by the power station control platform. The voltage transient regulation performance of renewable energy power stations includes two important indicators: the time required for the overshoot of voltage regulation to reach the target value. The magnitude of the performance is related to the stability of the grid voltage and the efficiency and stability of the dispatching remote control.

[0004] At present, the collection of analog quantities of renewable energy power plants can be achieved through portable fault recorders, but portable fault recorders lack the ability to process automated messages and cannot collect the time when the dispatch command arrives at the AVC substation, and thus cannot calculate the response time of renewable energy power plants. On the other hand, the existing test system uses Windows operating system time, with a time accuracy of seconds, which cannot meet the accuracy requirements of response time testing.

[0005] After searching, no public documents of the prior art that are identical or similar to the present invention were found. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to propose a distributed renewable energy power station voltage regulation transient performance testing system and method with reasonable design, accurate calculation results and high acquisition accuracy.

[0007] The present invention solves the practical problem by adopting the following technical solutions:

[0008] A distributed renewable energy power station voltage regulation transient performance test system, comprising: a computer, a message mapping device, a switch, an analog quantity acquisition device, a clock source device, an AVC substation and an execution terminal;

[0009] The computer is connected to a message mapping device for converting the command state in the computer memory into a relay switch state;

[0010] The message mapping device is connected to the analog quantity acquisition device and is used to collect the closing time of the switch relay in the message mapping device;

[0011] The computer is also connected to the AVC substation via a switch, and is used to transmit the instruction message to the AVC substation;

[0012] The computer is also connected to the execution terminal via a switch, and is used to transmit the execution result of the execution terminal back to the computer;

[0013] The output end of the AVC substation is connected to an analog quantity acquisition device for acquiring the voltage and current of the new energy power station and outputting the acquired results to a computer;

[0014] The output end of the AVC substation is also connected to the execution terminal for transmitting the voltage regulation instruction to the execution terminal;

[0015] The output end of the clock source device is connected to the AVC substation and the computer respectively, and is used to provide time synchronization for the AVC substation and the computer.

[0016] Moreover, the message mapping device includes a single chip microcomputer and a relay, and the single chip microcomputer and the relay are connected to transmit a command start signal from the computer to the single chip microcomputer via USB, and drive the relay to operate through the single chip microcomputer output.

[0017] A method for testing the transient performance of voltage regulation of a distributed renewable energy power station comprises the following steps:

[0018] Step 1: Input the target voltage command Ut through the computer human-machine interface, the computer simulates the dispatching master station to send the adjustment command to the AVC substation, obtains the time t1 of the command issuance from the clock source device through the SNTP protocol, and combines it into a TCP message according to the 104 protocol;

[0019] Step 2, the message mapping device closes the relay according to the data changes in the single-chip memory;

[0020] Step 3: After receiving the adjustment instruction, the AVC substation performs protocol conversion and sends the target instruction to the execution terminal through the switch; the computer obtains the 104 protocol data packet sent by the AVC substation to the execution terminal through network analysis, and obtains the instruction time t2 therein;

[0021] Step 4: The analog quantity acquisition device collects the voltage and current of the grid connection point and sends them to the computer through the USB port; the computer calculates the effective value of the voltage of the new energy power station and compares it with the target value. When the conditions are met, the time t3 when the target value is reached is recorded; the computer records the maximum value Um of the grid connection point voltage after the instruction is issued;

[0022] Step 5: Calculate the adjustment performance index.

[0023] Moreover, the regulation performance index is: time to reach the target value T=t3-t1; overregulation index M=Um-Ut.

[0024] Advantages and beneficial effects of the present invention:

[0025] The present invention solves the problem that the command received by the AVC substation is a network message, the adjustment result is an analog quantity, and the adjustment time cannot be simply compared. On the one hand, the response time of the new energy power station is calculated by comparing the message time and the adjustment result time; on the other hand, the command start bit is mapped to the relay output contact through the message mapping device, and recorded by the analog quantity acquisition device. The present invention can verify each other in two ways to improve the measurement accuracy. Through the device and method of the present invention, the voltage regulation transient performance index of the new energy power station can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall structure diagram of the present invention;

[0027] Figure 2 is a process flow chart of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the message mapping device of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0030] A distributed renewable energy power station voltage regulation transient performance test system, such as Figure 1 As shown, it includes: a computer, a message mapping device, a switch, an analog quantity acquisition device, a clock source device, an AVC substation and an execution terminal;

[0031] The computer is connected to a message mapping device for converting the command state in the computer memory into a relay switch state;

[0032] The message mapping device is connected to the analog quantity acquisition device and is used to collect the closing time of the switch relay in the message mapping device;

[0033] The computer is also connected to the AVC substation via a switch, and is used to transmit the instruction message to the AVC substation;

[0034] The computer is also connected to the execution terminal via a switch, and is used to transmit the execution result of the execution terminal back to the computer;

[0035] The output end of the AVC substation is connected to an analog quantity acquisition device for acquiring the voltage and current of the new energy power station and outputting the acquired results to a computer;

[0036] The output end of the AVC substation is also connected to the execution terminal for transmitting the voltage regulation instruction to the execution terminal;

[0037] The output end of the clock source device is connected to the AVC substation and the computer respectively, and is used to provide time synchronization for the AVC substation and the computer.

[0038] In this embodiment, if Figure 3 As shown, the message mapping device includes a single-chip microcomputer and a relay, and the single-chip microcomputer and the relay are connected to transmit a command start signal from a computer to the single-chip microcomputer via a USB, and drive the relay to operate through the output of the single-chip microcomputer.

[0039] The composition and function of each component device of the present invention are further described below:

[0040] Computer: A laptop computer with a network RJ45 port and a USB port can be used.

[0041] Message mapping device: ① The message mapping device is connected to the laptop computer through the USB module. The USB device completes the basic function of communicating with the computer and transmits the computer data to the microcontroller memory. ② The microcontroller receives the data transmitted by USB and stores it in the memory, and outputs the command status to the chip pin to drive the relay. ③ The relay outputs the pin status of the microcontroller to the analog acquisition device.

[0042] Switch: Connect with computer, AVC substation and execution terminal through twisted pair cable, and use 5-port switch. Use TCP / IP protocol to communicate with connected devices.

[0043] Analog quantity acquisition device: connected to the message mapping device through the test line, collects the closing time of the switch relay, connected to the AVC execution terminal through the test line, collects the voltage and current of the new energy power station. Connected to the laptop through the USB interface, the collected results are transmitted to the computer.

[0044] Clock source device: connected to the computer via twisted pair cable. Communicates with the computer via SNTP protocol.

[0045] A method for testing the transient performance of voltage regulation in a distributed renewable energy power station, such as Figure 2 As shown, the following steps are included:

[0046] Step 1: Input the target voltage instruction Ut through the computer human-machine interface. The computer simulates the dispatching master station sending the adjustment instruction to the AVC substation. The time t1 when the instruction is issued is obtained from the clock source device through the SNTP protocol, and is combined into a TCP message according to the 104 protocol.

[0047] Step 2: The message mapping device closes the relay according to the data changes in the microcontroller memory.

[0048] Step 3: After receiving the adjustment instruction, the AVC substation performs protocol conversion and sends the target instruction to the execution terminal through the switch; the computer obtains the 104 protocol data packet sent by the AVC substation to the execution terminal through network analysis, and obtains the instruction time t2 therein.

[0049] Step 4: The analog quantity acquisition device collects the voltage and current of the grid connection point and sends them to the computer through the USB port. The computer calculates the effective value of the voltage of the new energy power station and compares it with the target value. When the conditions are met, the time t3 when the target value is reached is recorded. The computer records the maximum value Um of the grid connection point voltage after the instruction is issued.

[0050] Step 5: Calculate the adjustment performance index.

[0051] Time to reach the target value T = t3-t1; overshoot indicator M = Um-Ut.

[0052] The working principle of the present invention is:

[0053] The present invention uses a clock source device to simulate the scheduling main station with a computer, sends a voltage adjustment instruction to the AVC substation, captures messages through a switch to obtain the time when the AVC substation sends the command to the execution terminal, and obtains the time when the controlled device reaches the adjustment target through a voltage and current acquisition device.

[0054] The present invention can not only calculate the adjustment time of the whole station, but also calculate the protocol conversion time of the AVC substation and the execution time of the execution terminal by capturing the instructions issued by the AVC substation, and the calculation result is accurate. Due to the delay of computer processing messages and collectors, the obtained measurement results have errors. The present invention adds a message mapping device, maps the computer memory field to the output of the relay action contact, collects through the analog device, and verifies with the computer direct calculation results, thereby improving the collection accuracy.

[0055] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0056] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0057] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

Claims

1. A distributed renewable energy power station voltage regulation transient performance test system, characterized by: include: Computer, message mapping device, switch, analog quantity acquisition device, clock source device, AVC substation and execution terminal; The computer is connected to a message mapping device for converting the command state in the computer memory into a relay switch state; The message mapping device is connected to the analog quantity acquisition device and is used to collect the closing time of the switch relay in the message mapping device; The computer is also connected to the AVC substation via a switch, and is used to transmit the instruction message to the AVC substation; The computer is also connected to the execution terminal via a switch, and is used to transmit the execution result of the execution terminal back to the computer; The output end of the AVC substation is connected to an analog quantity acquisition device for acquiring the voltage and current of the new energy power station and outputting the acquired results to a computer; The output end of the AVC substation is also connected to the execution terminal for transmitting the voltage regulation instruction to the execution terminal; The output end of the clock source device is connected to the AVC substation and the computer respectively, and is used to provide time synchronization for the AVC substation and the computer; The message mapping device comprises a single chip microcomputer and a relay, wherein the single chip microcomputer and the relay are connected and used for transmitting a command start signal from a computer to the single chip microcomputer via a USB, and driving the relay to operate through the output of the single chip microcomputer.

2. A method for testing transient performance of voltage regulation of a distributed renewable energy power station, characterized in that: The following steps are involved: Step 1: Input the target voltage command Ut through the computer human-machine interface, the computer simulates the dispatching master station to send the adjustment command to the AVC substation, obtains the time t1 of the command issuance from the clock source device through the SNTP protocol, and combines it into a TCP message according to the 104 protocol; Step 2, the message mapping device closes the relay according to the data changes in the single-chip memory; Step 3: After receiving the adjustment instruction, the AVC substation performs protocol conversion and sends the target instruction to the execution terminal through the switch; the computer obtains the 104 protocol data packet sent by the AVC substation to the execution terminal through network analysis, and obtains the instruction time t2 therein; Step 4: The analog quantity acquisition device collects the voltage and current of the grid connection point and sends them to the computer through the USB port; the computer calculates the effective value of the voltage of the new energy power station and compares it with the target value. When the conditions are met, the time t3 when the target value is reached is recorded; the computer records the maximum value Um of the grid connection point voltage after the instruction is issued; Step 5: Calculate the adjustment performance index.

3. A method for testing transient performance of voltage regulation of a distributed renewable energy power station according to claim 2, characterized in that: The regulation performance indicators of step 5 are: target value time T=t3-t1; overshoot indicator M=Um-Ut.

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